Nexus dreams of mass murderers. And when he wakes, he is compelled to seek them out and assassinate them. His fusion powers , derived from the stars, are almost limitless, but there is a price: he must kill victims chosen by the mysterious Merk, an alien being with an alien sense of justice.
Nexus is Horatio Hellpop. He lives on Ylum, a moon orbiting the dead planet Marlis in a remote sector of our galaxy. He did not choose to be the Nexus, the Merk choose him. His first victim was Horatio's own father. Even though all those on the Merk's list may deserve the death sentence for their crimes, Nexus would stop if he could; but then the Merk would cut off his power, and Ylum, home of thousands of refugees, would fall prey to all Nexus' enemies. And an assassin has many enemies.